20829788 has 12 divisors (see below), whose sum is σ = 41659632. Its totient is φ = 8927040.

The previous prime is 20829749. The next prime is 20829821. The reversal of 20829788 is 88792802.

20829788 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 371933 + ... + 371988.

It is an arithmetic number, because the mean of its divisors is an integer number (3471636).

Almost surely, 2^20829788 is an apocalyptic number.

20829788 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20829788 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20829788 is a wasteful number, since it uses less digits than its factorization.

20829788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 743932 (or 743930 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 44.

The square root of 20829788 is about 4563.9662575440. The cubic root of 20829788 is about 275.1449946121.

The spelling of 20829788 in words is "twenty million, eight hundred twenty-nine thousand, seven hundred eighty-eight".